Summary
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This project examined the relationship between psychophysical performance and fMRI activity. Participants were shown a feature difference task where no noise dots were presented and the participant judged the depth of a central plane relative to the surrounding RDS. Thus, the difficulty arises by internal noise (rather than an external noise manipulation). We manipulated performance by varying the disparity difference between central and surround target planes. We then sought to find cortical regions whose activity varied in the same parametric manner.

Stimuli
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Random-dot stereograms generated in C#. All dots were correlated and given a disparity. The surrounding disparity was presented at a crossed (near) disparity of 12 arcmin and this was fixed for all trials. The central target plane varied relative to this plane, and appeared either 6, 18, 30, 60, 240 arcsec in front or behind this plane.   

Behavioural Results
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Note that there are two response types:
ResponeType = 1
If a green triangle appears, the participant presses button '3' for NEAR and '4' for FAR (and vice versa if a red square appears).
ResponseType = 2
If a green triangle appears, the participant presses button '3' for FAR and '4' for NEAR (and vice versa if a red square appears).